diff --git a/demos/interactive/console.php b/demos/interactive/console.php
index c8fbca77ce..0d3dcde1ad 100644
--- a/demos/interactive/console.php
+++ b/demos/interactive/console.php
@@ -88,15 +88,11 @@ public function generateReport()
     ]);
     $message = Message::addTo($vp, ['This demo may not work', 'type' => 'warning']);
     $message->text->addParagraph('This demo requires Linux OS and will display error otherwise.');
-    $console = Console::addTo($vp)->set(static function (Console $console) {
+    Console::addTo($vp)->set(static function (Console $console) {
         $console->exec('/sbin/ping', ['-c', '5', '-i', '1', '192.168.0.1']);
         $console->exec('/sbin/ping', ['-c', '5', '-i', '2', '8.8.8.8']);
         $console->exec('/bin/no-such-command');
     });
-    $console->js(true, new \Atk4\Ui\Js\JsExpression(<<<'JS'
-        console.log([l]);
-        atk.elementRemoveObserver.addHandler($('#' + [id])[ 0], function () { console.log([ul]); });
-        JS, ['l' => 'loaded', 'ul' => 'unloaded - working!', 'id' => $console->getHtmlId()]));
 });
 
 $tab = $tabs->addTab('composer update', static function (VirtualPage $vp) {
diff --git a/src/Console.php b/src/Console.php
index 554d0a02b5..aaa386baec 100644
--- a/src/Console.php
+++ b/src/Console.php
@@ -271,47 +271,44 @@ public function exec(string $command, array $args = []): ?bool
             return null;
         }
 
-        usleep(250_000);
-        $this->output('sleep(0.25)');
-
-//        [$proc, $pipes] = $this->execRaw($command, $args);
-//
-//        stream_set_blocking($pipes[1], false);
-//        stream_set_blocking($pipes[2], false);
-//        // $pipes contain streams that are still open and not EOF
-//        while ($pipes) { // @TODO this condition is always true
-//            $read = $pipes;
-//            $j1 = null;
-//            $j2 = null;
-//            if (stream_select($read, $j1, $j2, 2) === false) {
-//                throw new Exception('Unexpected stream_select() result');
-//            }
-//
-//            $status = proc_get_status($proc);
-//            if (!$status['running']) {
-//                proc_close($proc);
-//
-//                break;
-//            }
-//
-//            foreach ($read as $f) {
-//                $data = rtrim((string) fgets($f));
-//                if ($data === '') {
-//                    // TODO fix coverage stability, add test with explicit empty string
-//                    // @codeCoverageIgnoreStart
-//                    continue;
-//                    // @codeCoverageIgnoreEnd
-//                }
-//
-//                if ($f === $pipes[2]) { // stderr
-//                    $this->warning($data);
-//                } else { // stdout
-//                    $this->output($data);
-//                }
-//            }
-//        }
-//
-//        $this->lastExitCode = $status['exitcode'];
+        [$proc, $pipes] = $this->execRaw($command, $args);
+
+        stream_set_blocking($pipes[1], false);
+        stream_set_blocking($pipes[2], false);
+        // $pipes contain streams that are still open and not EOF
+        while ($pipes) { // @TODO this condition is always true
+            $read = $pipes;
+            $j1 = null;
+            $j2 = null;
+            if (stream_select($read, $j1, $j2, 2) === false) {
+                throw new Exception('Unexpected stream_select() result');
+            }
+
+            $status = proc_get_status($proc);
+            if (!$status['running']) {
+                proc_close($proc);
+
+                break;
+            }
+
+            foreach ($read as $f) {
+                $data = rtrim((string) fgets($f));
+                if ($data === '') {
+                    // TODO fix coverage stability, add test with explicit empty string
+                    // @codeCoverageIgnoreStart
+                    continue;
+                    // @codeCoverageIgnoreEnd
+                }
+
+                if ($f === $pipes[2]) { // stderr
+                    $this->warning($data);
+                } else { // stdout
+                    $this->output($data);
+                }
+            }
+        }
+
+        $this->lastExitCode = $status['exitcode'];
 
         return $this->lastExitCode ? false : true;
     }